777,you should have a current W & B loadsheet if you are operating the a/c,usually CAA recommended every 5-10 yrs.If not, google Planeweighs or Loadmasters ,they have comprehensive records,relatively cheap,cheaper if you can get a couple of other a/c done at same time. If it`s just the chapter out of the AP,sorry,can`t help,but see Beagle`s bit..